Spinach, Bacon, and Goat Cheese Frittata

1 tablespoon canola or sunflower oil 3 ounces pancetta or bacon, cut into small cubes 4 shallots, thinly sliced 3 cups young leaf spinach 8 eggs 1/4 cup grated Parmesan, Cheddar, or other hard cheese A grating or two of nutmeg Sea salt and freshly ground black pepper 1/2 cup crumbled soft goat cheese